London - Defending champion Andy Murray celebrated the news that he's about to become a father again by reaching the Wimbledon second round Monday as fellow two-time winner Rafael Nadal aimed to clinch the 850th win of his career.
Top seed and world number one Murray downed Kazakh lucky loser Alexander Bublik 6-1, 6-4, 6-2, shrugging off two brief rain delays and showing little sign of the hip problem which had plagued him in the build-up.
"I have felt OK the last few days and the adrenaline you feel by playing a match numbs any pain you may have," said the British star after seeing off world number 134 Bublik who was making his grass court debut.
"Bublik is a bit of a character. He's a bit different from other players, tries different shots and the crowd enjoyed the way he plays."
Murray, whose baby daughter Sophia was born last year, next faces Dustin Brown, the man who knocked out Nadal two years ago.
German world number 97 Brown came back from a set and a break down to beat Portugal's Joao Sousa 3-6, 7-6 (7/5), 6-4, 6-4.
Nick Kyrgios, who shocked Nadal at Wimbledon in 2014, won't get another opportunity.
The combustible 20th seeded Australian was 6-3, 6-4 down to France's Pierre-Hugues Herbert when he called it quits on Court Three after failing to shake off the hip injury which has plagued him in recent weeks.
"I kind of knew I was in trouble. I have been feeling my hip ever since I fell over at Queen's Club," Kyrgios said.
"Never got it right. I was doing everything I could to help it, but just not enough time. Yeah, I mean, I just wasn't 100 percent.
Kei Nishikori, the Japanese ninth seed, beat Italy's Marco Cecchinato 6-2, 6-2, 6-0 in just 72 minutes.
French 12th seed Jo-Wilfried Tsonga, twice a semi-finalist, eased past British wild card Cameron Norrie 6-3, 6-2, 6-2.
Sam Querrey of the United States, who stunned Novak Djokovic in the third round last year and precipitated the Serb's slide from the top, also made the second round.
The 24th seed saw off Italy's Thomas Fabbiano 7-6 (7/5), 7-5, 6-2.
Women's second seed Simona Halep, blasted off court in the French Open final by Jelena Ostapenko, downed New Zealand qualifier Marina Erakovic 6-4, 6-1.
Halep, a Wimbledon semi-finalist in 2014, next faces Brazil's Beatriz Haddad Maria.
Venus Williams marked her 20th Wimbledon anniversary with a 7-6 (9/7), 6-4 win against Belgium's Elise Mertens.
The 37-year-old five-time champion arrived in London facing a wrongful death suit after she was involved in a fatal car crash in Florida.
An elderly man in the other vehicle suffered head injuries in the collision and died on June 22.
Williams will face China's Wang Qiang for a place in the last 32.
Later Monday, Nadal, the champion in 2008 and 2010 and a three-time runner-up, faces Australia's John Millman, the world number 137.
The Spaniard missed last year's championships because of a wrist injury but is back at the All England Club buoyed by his 10th French Open title.
Nadal is bidding to record his 850th tour-level match-win and become just the seventh player in history to reach the landmark.
It's also his 50th match at Wimbledon.
Millman is playing just his second match of the year after missing five months with a hip injury.
Former world number one Victoria Azarenka plays her first Slam since becoming a mother, while two-time champion Petra Kvitova is sure to receive a warm Centre Court welcome as she steadily rebuilds her career after being attacked by a knifeman in her home last December.
Kvitova, whose career was almost ended by the injuries caused fighting off an intruder at her home in the Czech Republic, takes on Sweden's Johann Larsson, the world 53.
In the absence of Serena Williams (pregnant) and Maria Sharapova (injured), Kvitova, boosted by winning the recent Birmingham grass court title, finds herself in the position of favourite for a third title to add to her 2011 and 2014 triumphs.
Azarenka, who starts against Catherine Bellis of the United States, will be playing her first Grand Slam since taking time off after last year's French Open to have her first child Leo in December.
The two-time Australian Open champion made the semi-finals at the All England Club in 2011 and 2012.
Kim Clijsters, Margaret Court and Evonne Goolagong are the only women to have won a Grand Slam after having a child.
Men's fifth seed Stan Wawrinka, looking to complete the career Slam, faces Russia's Daniil Medvedev.
French Open winner Jelena Ostapenko, the 2014 Wimbledon junior champion, takes on Aliaksandra Sasnovich of Belarus.
Wimbledon results on Monday, the first day of the 2017 championships at the All England Club (x denotes seeding):
Andy Murray (GBR x1) bt Alexander Bublik (KAZ) 6-1, 6-4, 6-2
Dustin Brown (GER) bt Joo Sousa (POR) 3-6, 7-6 (7/5), 6-4, 6-4
Pierre-Hugues Herbert (FRA) bt Nick Kyrgios (AUS x20) 6-3, 6-4 -- retired
Benot Paire (FRA) bt Rogrio Dutra Silva (BRA) 6-4, 3-6, 7-6 (12/10), 6-4
Jerzy Janowicz (POL) bt Denis Shapovalov (CAN) 6-4, 3-6, 6-3, 7-6 (7/2)
Jo-Wilfried Tsonga (FRA x12) bt Cameron Norrie (GBR) 6-3, 6-2, 6-2
Simone Bolelli (ITA) bt Lu Yen-Hsun (TPE) 6-3, 1-6, 6-3, 6-4
Nikoloz Basilashvili (GEO) bt Carlos Berlocq (ARG) 6-4, 7-6 (7/3), 6-1
Sam Querrey (USA x24) bt Thomas Fabbiano (ITA) 7-6 (7/5), 7-5, 6-2
Kevin Anderson (RSA) bt Fernando Verdasco (ESP x31) 2-6, 7-6 (7/5), 7-6 (10/8), 6-3
Andreas Seppi (ITA) bt Norbert Gombos (SVK) 6-2, 3-6, 6-2, 6-1
Donald Young (USA) bt Denis Istomin (UZB) 5-7, 6-4, 6-4, 4-2 -- retired
Thiago Monteiro (BRA) bt Andrew Whittington (AUS) 4-6, 6-3, 7-6 (7/4), 7-6 (7/5)
Karen Khachanov (RUS x30) bt Andrey Kuznetsov (RUS) 7-6 (7/4), 2-6, 6-3, 1-6, 6-2
Kei Nishikori (JPN x9) bt Marco Cecchinato (ITA) 6-2, 6-2, 6-0
Roberto Bautista (ESP x18) bt Andreas Haider-Maurer (AUT) 6-3, 6-1, 6-2
Florian Mayer (GER) bt Viktor Troicki (SRB) 6-1 -- retired
Barbora Strcov (CZE x22) bt Vernica Cepede (PAR) 6-3, 6-3
Wang Qiang (CHN) bt Kai-Chen Chang (TPE) 6-3, 6-4
Venus Williams (USA x10) bt Elise Mertens (BEL) 7-6 (9/7), 6-4
Camila Giorgi (ITA) bt Alize Cornet (FRA) 5-7, 6-4, 6-4
Madison Keys (USA x17) bt Nao Hibino (JPN) 6-4, 6-2
Carina Witthoeft (GER) bt Mirjana Lucic-Baroni (CRO x26) 6-3, 5-7, 8-6
Aryna Sabalenka (BLR) bt Irina Khromacheva (RUS) 6-3, 6-4
Francesca Schiavone (ITA) bt Mandy Minella (LUX) 6-1, 6-1
Elina Svitolina (UKR x4) bt Ashleigh Barty (AUS) 7-5, 7-6 (10/8)
Maria Sakkari (GRE) bt Katerina Siniakov (CZE) 6-3, 6-4
Kristna Plskov (CZE) bt Roberta Vinci (ITA x31) 7-6 (8/6), 6-2
Beatriz Haddad Maia (BRA) bt Laura Robson (GBR) 6-4, 6-2
Simona Halep (ROM x2) bt Marina Erakovic (NZL) 6-4, 6-1